Texas Instruments INA293B2IDBVT

Overview

INA293B2IDBVT from Texas Instruments is an ultra-precise current sense amplifier designed for high-side or low-side shunt monitoring in 48-V power systems. It delivers 50 V/V fixed gain, ±15 µV typical input offset voltage, 160-dB DC CMRR, and 1.3-MHz bandwidth - enabling accurate, fast-response current measurement in telecom and server PSU protection circuits.

For engineers reviewing the INA293B2IDBVT datasheet, INA293B2IDBVT pinout, INA293B2IDBVT application, or INA293B2IDBVT equivalent, key selection criteria include common-mode range (–4 V to +110 V), gain accuracy (±0.15% max), temperature drift (±0.05 µV/°C), and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The INA293B2IDBVT uses a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current at 110 V common-mode voltage. Its zero-drift input stage ensures stable offset performance across –40°C to +125°C, while internal precision resistor network fixes gain at 50 V/V without external components.

This variant supports unidirectional current sensing only, with output swing limited to GND + 0.02 V (min) and VS – 0.15 V (min) under load. Its 2.5 V/µs slew rate and <2 µs response time for 75-A overcurrent events on a 2-mΩ shunt make it suitable for fast fault detection in 48-V BMS and RRU power rails.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sense amplifier applications.

Compared with INA240A2IDR and LT6106IMS8#TRPBF, the INA293B2IDBVT provides superior DC precision (160-dB CMRR, ±15 µV offset), extended negative common-mode capability (–4 V), and faster transient response - making it optimal for telecom-grade 48-V power integrity monitoring where measurement fidelity directly impacts system reliability.

Availability

INA293B2IDBVT is available at Aetrix Electronics and suitable for active antenna systems, macro remote radio units, and 48-V rack server power supplies requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for INA293B2IDBVT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision signal chain solutions.

The INA293 product line targets ultra-precise current sensing in high-voltage, high-noise environments such as 48-V telecom and data center power systems - emphasizing DC accuracy, AC noise rejection, and robust transient performance.

FAQ

What is the maximum common-mode voltage the INA293B2IDBVT can handle during normal operation?

The INA293B2IDBVT operates reliably from –4 V to +110 V common-mode voltage. This range allows it to monitor current on both high-side and low-side shunt configurations, including scenarios where the sensed node falls slightly below ground-such as recirculating current paths in half-bridge motor drives. The device survives transient exposures up to –20 V and +120 V without damage.

Does the INA293B2IDBVT support bidirectional current sensing?

No, the INA293B2IDBVT operates in unidirectional mode only-it measures current flowing from power supply to load. While its –4 V to +110 V common-mode range supports sensing below ground, the output polarity does not invert for reverse current. For true bidirectional measurement, external circuitry or a different amplifier such as the INA229 must be used. The INA293B2IDBVT datasheet explicitly states unidirectional functionality in Section 7.4.1.

What is the typical input bias current of the INA293B2IDBVT at 48-V common-mode voltage?

At 48-V common-mode voltage and TA = 25°C, the INA293B2IDBVT exhibits 10 µA to 20 µA typical input bias current on both IN+ and IN− pins. This low bias current minimizes voltage error across high-value shunt resistors and remains stable across temperature and supply voltage-critical for maintaining accuracy in 48-V BMS and server PSU applications where shunt values often exceed 10 mΩ.

Can the INA293B2IDBVT be used with a 3.3-V supply voltage?

Yes, the INA293B2IDBVT supports supply voltages from 2.7 V to 20 V, including 3.3 V. At 3.3 V, its output swings from GND + 0.02 V to VS – 0.15 V (i.e., up to 3.15 V), enabling direct interface with 3.3-V SAR ADCs. Quiescent current remains ~1.5 mA, and all key specs-including 50 V/V gain, 160-dB CMRR, and 1.3-MHz bandwidth-are fully guaranteed across this supply range per Section 6.3 of the datasheet.

How does the gain option of the INA293B2IDBVT relate to its part number suffix?

The "B2" in INA293B2IDBVT explicitly denotes the 50 V/V gain version. Per TI's naming convention: "A1/B1" = 20 V/V, "A2/B2" = 50 V/V, "A3/B3" = 100 V/V, "A4/B4" = 200 V/V, and "A5/B5" = 500 V/V. The "B" prefix indicates the DBV (SOT-23-5) package with pinout variant B (IN+ on pin 4, IN− on pin 5), distinguishing it from variant A (IN+ on pin 3, IN− on pin 4).